Carburetor



' K. MAYBACH CARBURETOR Filed nay 2o, 1921 v ,'INVBNTUR' the danger of the carburetor any fuel overflowing with a disk 6 having a pipe 1. extends to the float Patented Aug. 3.1, 1926.

PATENT oFFIcE.

KARL MAYBACH, or FRIEDRIcnsHAFnN,

-BAcH-MOTORENBAU GESELLSCHAFT GERMANY, ASSIGNOR TO THE FIRM MIT BES()IHRANKTIRl HAFTUNG, OF FRIE- DBICHSHAFEN-ON-THE-IBODENSEE, GERMANY.

CARBURETOR.

Application filed Hay 20, 1921,` SerialNo. 471,268, and in germany May 15, 1920.

(GRANTED UNDER THE PROVISIONS 0E THE ACT 0F MARCH 3, 1921, 41 STA'J; 14,1313.)

My invention relates to carburetors for internal combustion engines and 1ts.part1cular object is to renderI the operation of such devices safer' and more effective. In order to maintainthe level ofthe fuel in carburetors as constant as possible, a float controlled valve is provided in the fuel supply pipe.

-`Now, it may occur,'.that when the float valve `does not operate as occurs at timeswhen dirt causes the valve'to stick, the fuel rises and finally floods the nozzle. This does not only mean a waste of fuel, but there is also catching lire. .The present invention provides a device associated with the nozzle for taking care of therefrom in the event of the float valve failing to act and carrying such fuel to a receptacleprovided for the purpose, so as to prevent escape of overliowed fuel4 at the engine and consequent danger oflire.l

In the drawings -appended to this specification and forming part thereof a device embodying my invention is., illustrated in section by way of example.

From the fuel tank, not shown, a supply chamber 2 and communicates therewith, the supply being controlled by a needle valve 5 which is actuated by a lioat 4. The iioat chamber is connected with a vertically arranged pipel 7 by means of a horizontal pipe 3 provided calibrated orifice therein to restrict the flow of fuel'from the float chamber, the disk being calibrated in accordance with the demandof the particular engine with whichthe device is to be associated. Y The pipe 7 extends somewhat beyond the level maintained by the float 4in chamber 2 so that fuel will flow over from" the pipe? only when the4 iioat fails'to operate. Into the pipe or jacket 7 there extends a nozzle 8 having anl outlet 9. Both the pipe 7 and the nozzle 8 are surrounded by .a'pipe 10 which connects with a suitable receptacle 11 vserving/to Lreceive `the fuel overflowed into the pipe 10.

In order'to prevent an escape of fuel when the'car is moving through arcurve or uphill,

lsuited for use the top edge of the pipe 7 is bent inwards thereby preventing theffuel from spurting out.

A regulating device which is particularly with a carburetor according invention, consists in a plu- 12 lin pipe 8 below the level of the fuel in float chamber 2. Such holes are preferably provided at various levels, and their numbers and diameters may diifer according to their level.

to the present rality of holes A device comprising a ypipe of reducedv cross-sectional area and a number of holes 12 in the suction tube will operate as/follows: g

When the engine is running slowly or at no load, and the consumption of fuel is small, the fuel level in pipe 7 is not much below that in chamber`2. is accelerated and consumes more fuel, the level in pipe 7 begins to sink. The furtler it sinks, the more holes 12 are uncovered and admit an increasing quantity of air from pipe 10, so' that the fuel supply is effectively reduced. The holes are so arranged and of such diameters that' the desired uniformity of mixture is attained with all speeds. f

Il wish it to be understood that desire to be limited tothe exact details of construction shown and described, ,for obvious modifications will occur to a pei-son skilled in the art.

I claim 1. Carburetor comprising in combination, a fuel chamber, means for constantly supplying fuel to said chamber, a float valve in said chamber for controlling the supply of fuel I do notA When the engine thereto, a fuel nozzle having'its upper end located above the upper fuel level in said chamber, a. tube surrounding said nozzle with the exception of the upper end thereof, a pipe connecting the vlower part of said chamber with the lower end of-said tube, and an overflow tube surrounding said tube with a clearance.

. 2. Carburetor comprising in combination,

a fuel chamber, means for constantly Vsupplying fuel to said chamber, in said chamber for controlling the suppl of fuel thereto, a fuel nozzle extending suba iioat valve stantially vertically alongside of said chamber with its upper end above the upper fuel level in said chamber, the wall of said nozzle having openings therein at different levels, etu'be surrounding said nozzle with the exception of the'upper end thereof, a pipe connecting the lower part of said hamber with the lower end of said tube, an overflow tube surrounding said tube with a Clearance and a receptacle underneath Said overflow 10 tube.

In testimony whereof I ax my signature. l

' KARL MAYBACH. 

